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The 1973–1974 L82 was a "performance" version of the 350 that still used the casting number 624 76cc chamber "2.02" heads but with a Rochester Quadra-jet 4bbl carburetor and dual-plane aluminum intake manifold, the earlier L46 350 hp (261 kW) 350 hydraulic-lifter cam, and 9.0:1 compression forged-aluminum pistons producing 250 hp (186 kW ...
The butterfly valve often contains a small "idle cutout", a hole that allows small amounts of fuel/air mixture into the engine even when the valve is fully closed, or the carburetor has a separate air bypass with its own idle jet. If the engine is operating under light or no load and low or closed throttle, there is high manifold vacuum.
A 4-barrel carburetor was mated to a high-rise, dual plane intake manifold feeding high-flow cylinder heads that are still considered among the best of that era. [ citation needed ] Its big ports used 2.02 in (51 mm) intake and 1.60 in (41 mm) exhaust valves.
The 302 featured 11:1 compression, forged pistons, forged steel crankshaft and connecting rods, solid lifters, and Holley carburetor on a dual-plane intake manifold. A dual four-barrel crossram intake manifold was available as a dealer-installed option. [23] 1969 Chevrolet Camaro Z28 in Daytona Yellow
Within 18 months, the design of the Chevy II was completed, including new 153 cu in (2,512 cc) four-cylinder and 194 cu in (3,185 cc) six-cylinder engines to power it. The 153 cu in engine had a 3 + 7 ⁄ 8-inch (98 mm) bore and 3 + 1 ⁄ 4-inch (82.6 mm) stroke, with two overhead valves per cylinder actuated by pushrods and a 1-3-4-2 firing order.
In cars, carburetor heat may be controlled automatically (e.g. by a wax-pellet driven flap in the air intake) or manually (often by rotating the air cleaner cover between 'summer' and 'winter' settings), with use both of "heat stove" type systems, and electric-filament booster elements directly attached to the carb or TBI module.